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Three to five cycling tests to exhaustion allow prediction of time to exhaustion (TTE) at any power-output based on calculation of critical power (CP). We aimed to determine the accuracy of CP predictions of TTE at power-outputs habitually endured by cyclists. Fourteen endurance-trained male cyclists underwent 4 randomized cycle-ergometer TTE tests at power-outputs eliciting, i) mean Wingate anaerobic test (WAnTmean), ii) VO2max, iii) respiratory compensation threshold (VT2) and iv) maximal lactate steady state (MLSS). Tests were conducted in duplicate with coefficient of variation of 5-9%. Power-outputs were 710±63 W for WAnTmean, 366±26 W for VO2max, 302±31 W for VT2 and 247±20 W for MLSS. Corresponding TTE were 00:29 ± 00:06, 03:23±00:45, 11:29±05:07 and 76:05±13:53 mm:ss, respectively. Power-output associated with CP was only 2% lower than MLSS (242±19 vs. 247±20 W; P<0.001). The CP predictions overestimated TTE at WAnTmean (00:24 ± 00:10 mm:ss) and MLSS (04:41 ± 11:47 mm:ss), underestimated TTE at VT2 (-04:18 ± 03:20 mm:ss; P<0.05) and correctly predicted TTE at VO2max. In summary, CP accurately predicts MLSS power-output and TTE at VO2max. However, it should not be used to estimate time to exhaustion in trained cyclists at higher or lower power-outputs (e.g., sprints and 40 km time trials). Novelty bullets: • Critical power (CP) calculation enables to predict time to exhaustion (TTE) at any cycling power-output • We tested those predictions against measured TTE in a wide range of cycling power-outputs. • CP appropriately predicted TTE at VO2max intensity but err at higher and lower cycling power-outputs.
This article was published in the following journal.
Name: Applied physiology, nutrition, and metabolism = Physiologie appliquee, nutrition et metabolisme
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A set of opposing, nonequilibrium reactions catalyzed by different enzymes which act simultaneously, with at least one of the reactions driven by ATP hydrolysis. The results of the cycle are that ATP energy is depleted, heat is produced and no net substrate-to-product conversion is achieved. Examples of substrate cycling are cycling of gluconeogenesis and glycolysis pathways and cycling of the triglycerides and fatty acid pathways. Rates of substrate cycling may be increased many-fold in association with hypermetabolic states resulting from severe burns, cold exposure, hyperthyroidism, or acute exercise.
The time span between the beginning of physical activity by an individual and the termination because of exhaustion.
The process of discovering or asserting an objective or intrinsic relation between two objects or concepts; a faculty or power that enables a person to make judgments; the process of bringing to light and asserting the implicit meaning of a concept; a critical evaluation of a person or situation.
Treatment using irradiation with light of low power intensity so that the effects are a response to the light and not due to heat. A variety of light sources, especially low-power lasers are used.
The ability to estimate periods of time lapsed or duration of time.
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